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Basic question on recovery and disk snapshotting

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We're running on EBS volumes on EC2.  We're interested in leveraging
EBS snapshotting for backups.  However, does this mean we'd need to
ensure our pg_xlog is on the same EBS volume as our data?

(I believe) the usual reasoning for separating pg_xlog onto a separate
volume is for performance.  However, if they are on different volumes,
the snapshots may be out of sync.

Thanks.


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